What is a Boiler ?
Boiler is any enclosed vessel where heating of fluid or gas takes place. The point to be noted that the vessel must be “Enclosed” for the heating to take place. And hence a “Pressure Cooker” can also be called as a Boiler.
How is Thermal Power Plant Boiler is different from other Boiler ?
In Thermal Power Plant Boiler, Coal is burnt to heat up the water. The fuel is burnt inside the Boiler, whereas the water which is heated runs in tubes on the surface of the Boiler.
Thermal Power Plant Boilers are different because of the complexity of the process and different types of system involve in the entire combustion process.
What do you mean by complexity of the process and the system involves ?
The primary aim of any thermal combustion system is to maximize the efficiency. i.e, net output energy we get, by input energy. The boiler designed in Thermal Power Plant serves the above end.
In Boilers differential heating takes place, and each area of the boiler has got different temperature. To maximize efficiency it is important to construct/assemble water tube in the way to maximize heat absorption by conduction, which gives rise to different process.
Ok, but what are the system involved ?
The following system is involved that are Economizer, Pre-heater and Re-heater.
In Civil Point of view, how is Boiler erected ?
To be answered
Since Coal burns at such a high temperature, what are the materials used to withstand such a high temperature ?
The boiler is lined with steel tube where feed water is boiled to produce steam. Most of the Boiler structure is made up of steel.